Shielded braid pin and socket connector



Feb. 15, 1966 M. F. oKEEFE ETAL 3,235,834

SHIELDED BRAID PIN AND SOCKET CONNECTOR 4 Sheets-Sheet 1 Filed Jan. 10.1964 IN VENTOR.

MmHAel. F-'mmnms FRANK Benn-Amm STARK BY HN Armen zmMlR/AN Sl Fb l5,1966 M. F. KEEFE ETAL 3,235,834

SHIELDED BRAID PIN AND SOCKET CONNECTOR Filed Jan. l0, 1964 4Sheets-Sheet 2 INVENTOR, MICHAEL FRANcIs o'KesH FRANK Elus-ANIM STARKIon-m Amun mman/mu Sl- Mlmfw Feb- 15, 1966 M. F. oKEEl-'E ETAL 3,235,334

SHIELDED BRAID PIN AND SOCKET CONNECTOR Filed Jan. l0, 1964 4Sheets-Sheet 4 United States Patent O 3,235,834 SHIELDED BRAID PIN ANDSOCKET CONNECTR Michael Francis OKeefe, Mechanicsburg, Frank BenjaminStark, Harrisburg, and John Aaron Zimmerman,

Jr., Hershey, Pa., assignors to AMP Incorporated,

Harrisburg, Pa.

Filed `Ian. 10, 1964, Ser. No. 336,909 6 Claims. (Cl. 339-177) Thisapplication is a continuation-in-part of our earlier led application,Serial No. 77,114 led December 20, 1960, and now abandoned.

Electrical conductors for special applications are frequently designedto preclude interference from outside sources with the signal on theconductor. This is particularly true in cables transmitting R.F. energy,communication wire, TV cable, radio, etc., wherein distortion of thesignal will destroy the intelligibility of the message. A commonpractice in overcoming this problem is the use of shielded wire. ThisWire commonly comprises an inner central conductor adapted to carry thesignal, surrounded by insulating material which, in turn, is surroundedby a metallic braided material. Any interference or static will bescreened out by the outer metallic braid, and thus the centralconductive core will not brook interference.

Another type of similar cable is that commonly called coaxial cable andwhich incorporates the advantages of shielded wire, but which, throughcareful selection of the material and specialized construction, has aninherent and controllable electrical impedance characteristic. Thischaracteristic is utilized in high-frequency circuits and becomes acritical part of the equipment.

It is an object of this invention to provide a means for joining thelength of such conductors in a fashion whereby they can easily beconnected and disconnected. It is also an object of this invention toprovide a means for joining a plurality of shielded conductors. Wherebythe central core of the one conductor is joined to the central core ofthe other, simultaneously the outer metallic sheathing of the rstconductor is joined to the outer metallic sheathing of the secondconductor.

Another object of this invention is to provide a juncture of the typewhereby the connectors preserve the fidelity of the signal by screeningout outside signals through the connector portion.

It is also an object of this invention to maintain, through carefuldesign considerati-ons, a suitable control of the connector inherentimpedance.

Also, it is an object of this invention to make such a connection in afashion whereby the connector is secured to the central core and theouter metallic braid at the same time by use of one crimped connection.

It is also an object of this invention to provide a plurality ofconnectors which may be housed in a polarized block and joined to amating block of identical conductors.

Other objects and attainments of the present invention will becomeapparent to those skilled in the art upon a reading of the followingdetailed description when taken in conjunction with the drawings inwhich there are shown and described illustrative embodiments of theinvention; it is to be understood, however, that these embodiments arenot intended to be exhaustive nor limiting of the invention but aregiven for purposes of illustration in order that others skilled in theart may fully understand the invention and the principles thereof andthe manner of applying it in practical use so that they may modify it invarious forms, each as may be best suited to the conditions of aparticular use.

In the drawings:

FIGURE 1 is a cross-sectional view taken through plane 1-1 of FIGURE 3,showing one embodiment of a device incorporating the principles of thispatent application;

FIGURE 1A is an exploded View of the device :shown in FIGURE 1;

FIGURE 2A is a view of one of the connector members of FIGURE l adaptedt0 be inserted into a connector block;

FIGURE 2B is a side view of a pair of connector members adapted to beinserted into a block;

FIGURE 3 is a sectional View taken through plane 3 3 of FIGURE 1;

FIGURE 4 is a perspective view of a pair of open blocks embodying theconnectors shown in `FIGURES 1-3;

FIGURE 5 is a sectional view similar to FIGURE 1 illustrating a secondembodiment of a device employing the principles of the invention;

FIGURE 6 is a perspective View of a pair of mating blocks having aplurality of the connectors of FIGURE 5 positioned therein andpolarized;

FIGURE 7 is a sectional view taken through plane 7 7 of FIGURE 5;

FIGURE 8 illustrates a device for inserting the connectors into theblock;

FIGURES l9-11 illustrate a device for extracting the connectors from theblock;

FIGURE 12 is an illustration of a third species of this invention;

FIGURES 13-15 are sectional views taken through planes 13-13, 14-14 and15-15, respectively, of FIG- URE l2;

FIGURE 16 illustrates a set of dies useful in crimping the connectorsonto the conductors; and

FIGURE 17 is a sectional view taken along plane 17- 17 showing the diesof FIGURE 16 in connector-crimping position.

As shown in the drawings, FIGURES 1 and 1A illustrate the connectorassembly which includes a female shell member 10. This shell isgenerally cylindrical and `talpers from a large diameter portion at oneend to an intenmediate diameter portion in the center, and then to asmall diameter port-ion at the opposite end. 'Ilhe intermediate centerdiameter portion has ya port hole 12 and an opposing port hole 14 on theopposite side. The large diameter portion has a lip or flange member 16at the free end. A panel mount 18, comprising .fa split ring having anindent 19, leaf springs 29 extending from the front end thereof, andanother set of leaf springs 22 intermediate the longer leaf springs 20,is adapted to be slipped over the intermediate section of the femaleshell. A plurality of tabs 24 extend outwardly fro-m the opposite end ofthe panel mount to form a flange. A dimpled section enters the portholes for retention by inherent spring action.

The end ferrule 26 has two different diameters, the larger diameterbeing bell-mouthed at one end to receive the small diameter of thefemale shell.

A spacer insert 28 is adapted to t inside of the large diameter of thefemale shell. This spacer insert is comprised of any suitable insulatingplastic, and tapers at one end to be received snugly by the female shell10. In the preferred embodiment the material of spacer 28 extends fromthe tapered end to form a cylindrical portion 29 having an innerdiameter to receive the insulation I of cable C. The insert 28 ispreferably continuous and integral from end to end, as better shown inFIGURE 1A, and this openates to prevent moisture or other contaminatesfrom entering the connector. Additionally, the portion 29 serves tobetter accommodate the insertion of cable and to preclude the accidentalinsertion of the strands of jacket I to short against the centerconductor A.

In each embodiment there is included a further feature which has beenfound to improve the electrical characteristics of the connector. Asshown in FIGURES 1 and 12, the portion of each shell having the taperbetween the small diameter portion and the forward portion is positionedrelative to the insulation inserts such that the rear end off eachconnector center contact and the end of the associated primaryinsulation I of the cable lie thereunder. This has been found to provideless energy loss at the point of electrical discontinuity of diameterchange in the shell to accommodate the added diameter of the centercontact. A male contact 30 comprises lan elongated tubular member havinga section 32 to accommodate the centnal core of the conductor and aforward section 34 to engage the complementary member of the opposingconnector member.

The male shell 40 is similar to the female shell, except that it onlyhas two diameter sections rather than three. As shown in FIGURE 2B, onesection of the large diameter has a U-shaped cut to provide a radialspring member 42. Ports 44 `and 46 in the male shell are equivalent ofthe ports 12 and 14 of the female shell. A panel mount 4S, identical tothe panel mount 18, is fitted over the male shell 40, and the endferrule 50 is identical to the end ferrule 26.

Spacer insert 52 corresponds to insert 28, but extends the full lengthof 40 to protrude from the endthereof as at 53. The portion 53 isbeveled as indicated to facilitate easy insert-ion of 40 within 10, andits extension axially is such that upon engagement of 40 within 10 theface thereof meets and abuts the face of insert 28. The rear portion of52 includes a sleeve extension identical in structure and function to 29of insert 28, and `the insert 52 is preferably of one piece from end toend, as better shown in FIGURE 1A. The shell 40 includes a male contactmember including an elongated tubular pin 56 at one end to receive theconducting member of the wire cable.

- In assembling the device, the shielded braid conductor, generallydesignated C (FIGURE 1), has shielding braid B, primary insulation I andan outside jacket I stripped back with the center conductor A exposed.Considering first the female section, the end ferrule 26 is slipped backover the outside jacket J of the braided conductor. rThe centerconductor is disposed centrally of the male contact 32. rIihe insulationI is fitted into the female shell and the small end of the femaleContact is located exteriorly of the central conductor A. The panelmount 18 can also be slipped back over the outside jacket J behind theend ferrule 26. The end ferrule is then shoved forwardly so that itgrips the braid portion between the tapering surface of the female shelland the inner surface on the end ferrule. In this position a pair ofdies (FIG- URE 16) `is impressed upon the assembly so that a small dieenters each of the ports 12 and 14 to crimp the female contact 32 ontothe conductor. Simultaneously, a part of the die compresses the endferrule 26 onJto the shielded braid to squeeze the braid between the endferrule 26 and the smallest diameter portion of the female shell 10.After the crimp is made, the panel mount assembly is moved forwardlyover the central portion of the female shell so that the detents 19latch onto the ports 12 and the dimpled section fits into the port holesand remains in place due to inherent spring action.

It is now possible to slip the assembled contact panel mount into anaperture 60 in a board 62 (FIGUR-E 1). The aperture has an internalsection of smaller diameter 64 so that the resilient spring members 22may contract to slip through and lock the assembly into the boardbetween the short springs 22 and t-he anges 24. The long springs tend tobow outwardly to firmly hold the device in position. A tool T, as shownin FIGURE 8, having a ferrule-holding member G and handle H may be usedin making the assembly.

The male member is similarly assembled and slipped into an equivalentopening in the opposite board member 62. It is now possible to join theshielded conductor at one side to the shielded conductor on the other bymating the male and female portions.

As shown in FIGURES 9-11, an extraction tool T', having a springcompressing sleeve R which is attached to a barrel member Q, is used inremoving the connector. A plunger P assists the operation.

As shown in FIGURE 4, a number of these male/female contacts areinserted into a pair of block members W and W. The male and femalecontacts are matched so that when the blocks are brought together, theconnectors are oriented to form a connection. The male and femaleconnectors on each block can be staggered so that half of the connectorsin a single block is male and the other half is female. A jack screw Slocated in the center of the one block fits into an aperture havingscrew threads N in the opposite block. The jack screw is pivotable sothat mating the two blocks together and rotating the jack screw willcause the connectors to be drawn together and locked.

A variation of the connector of FIGURE 1 is shown in FIGURE 5. In thisembodiment the connector has a spacer insert on the female member only,extending along its length and relieved about its forward end. Also, thespring members are of equal length and bear against the flange in theblock to retain the connector therein. Each of the blocks W and W havemale connectors M, as well as female connectors F, respectively, locatedtherein. The male connector has an end ferrule 50 which is crimped ontoa braid portion B of a connector C. This secures the braid to a maleshell 40 having a central male contact 56 crimped therein. The panelmount member 48 has a series of leaf springs 49', all of equal length,and flanges 51 emanate from the opposite end of the panel mount. Thus,it is seen that the male connector may be inserted into the block andthe springs 49 will be retracted when they pass the recessed portion U.Having passed this portion, they will flare out again to retain theconnector in the block by means of the cooperation between the leafsprings 49 and the flanges 51 bearing against the shoulders formed bythe recessed portion. It is observed that there is a spacer insert inthe male shell, as shown at 52 in the prior embodiment which extendsover the half of the contact 56, such that with M and F engaged there isno air space left therebetween.

The female connector is identical with the male connector, except thatthe female contact 30 comprises a hollow split pin rather than a solidcylindrical member, and the spacer insert 28 extends the full length ofthe female contact 30. Thus, the connection is entirely surrounded byinsulation. The connectors F and M both include apertures in the outershells as well as in the inserts in the same manner as the embodiment ofFIGURE l. The panel mount members are also indented to engage theconnector apertures. As shown in FIGURE 6, an embodiment of this typemay be set into blocks which are recessed at their jointure (note E).When the blocks are connected together, the block housing completelyinsulates the connection.

As shown in FIGURES 12-15, another embodiment suitable for connecting toa panel includes an end which is crimped onto the braid connector B anda male shell 102 having a reduced portion 104. The reduced portion fitsunder the braid so that the end ferrule 100 crimps the braid betweenitself and the end portion. A spacer insert 106 is located centrally ofthe male shell 102. This spacer insert includes an aperture 108 (FIG-URE 15) which permits crimping through the insert to crimp the centralmale contact 110 to the central conductor core 112. The female portionhas an end ferrule 114 which crimps the braid B to the end portion 116of a female shell 118. An internal female shell is located Within thespacer insert 122. One end ofthe female shell 118 has a flange 124 whichabuts against a plate or chassis panel 126. The exterior surface of thefemale shell has a threaded portion 130. A washer 132 abuts the panel126 on the inside and a lock nut 134 secures the female shell to thepanel. The lock nut threads onto the outside surface of the femaleshell. A locking cylinder 136 is slidable over the male shell and has aninner threaded surface 138. The back end of the locking cylinder has ashoulder 140 which bears against a shoulder 142 on the outside backsurface of the male shell. When the male and female contact members aresecured together, threading the cylinder 136 onto the female shell pullsthe two members into tight engagement and holds them there.

A set of dies for crimping the braid to the connector and simultaneouslycrimping the central Core .is shown in FIGURES 16 and 17. A first die200 lbears against the upper surface of the end ferrule and acomplementary die 202 is impressed against the lower surface. A secondupper die 204 is secured to the first upper die and the Idie 204 isdisposed from the die 200 at a distance equal to tbe location of theport in the spacing insert. A similar die 206 is secured to the bottomdie 202. Thus, when the upper and lower dies 200 and 202 are brought tobear against the end ferrule, the core crimping dies 204 and 206 aresimultaneously impressed on the central conductor of the wire. Thiseffects a one-stroke crimping operation to secure the central conductorto its ferrule, as well as securing the braid to the shell. An extensionof the outer ferrule provides strain relief at the point where the cableenters the shell. Also, this arrangement locates the conductor crimpingdies with respect to the braid crimping dies.

Changes in construction Will occur to those skilled in the art andvarious apparently different modifications and embodiments may be madewithout departing from the scope of the invention. The matter set forthin the foregoing description and accompanying drawings is offered by wayof illustration only.

We claim:

1. An impoved connector for interconnecting electrical signal cables ofthe type having a center conductor surrounded by an insulating sheathwith an outer metallic braid thereover surrounded by a protectivejacket, comprising in combination, a pair of metallic shell members eachhaving rear sleeve extensions which each have a diameter approximatingthat of the braid of the cable to be interconnected such as to be fittedbetween cable braid and over the lcable insulating sheath with theinsulating sheath and center conductor extending within each shellmember, a ferrule for each said extension of a diameter to permit saidferrule to be fitted over the cable jacket and crimped inwardly to gripthe said cable and force said braid into electrical contact with eachextension, each shell member having a forward portion of a diameter suchthat the shell members are adapted to be telescopically engaged onewithin the other in a sliding frictional fit to provide electricalConnection therebetween, a conductive pin member coaxially disposed inforward portions of each shell member, each of said pin members having abore at one end adapted to receive cable center conductor and bedeformed inwardly thereagainst, apertures in each said shell memberoverlying said pin bores to permit die insertion for deforming said pinmembers, the pin members having forward portions which are of diameterssuch that the members are adapted to be telescopically engaged onewithin the other in a sliding frictional fit to provide an electricalconnection therebetween, each pin member supported by an insulatingmember secured to said shell and in form fitting contact with the pinmembers along a substantial portion proximate said one end, theinsulating member of one shell member extending over the entire lengthof the pin member of the same shell member and the insulating member ofthe other shell member extending over the length of the associated pinmember less the length of the telescopic engagement whereby air voidswithin said shell members are minimized, each said insulating memberincluding an integral portion extending along and in contact with theinner surface of said rear extension and beneath the area to be crimpedand including a bore adapted to receive and support the insulatingsheath of said cable along the length of the extension.

2. An improved connector for interconnecting electrical signal cables ofthe type having a center conductor surrounded by an insulating sheathwith an outer metallic braid thereover surrounded by a protectivejacket, comprising in combination, a pair of metallic shell members eachhaving rear sleeve extensions which each have a diameter approximatingthat of the braid of the cable to be interconnected such as to be fittedbetween cable braid and over the cable insulating sheath with theinsulating sheath and center conductor extending within each shellmember, a ferrule for each said extension of a diameter to permit saidferrule to be fitted over the cable jacket and crimped inwardly to gripthe said cable and force said braid into electrical Contact with eachextension, each shell member having a forward portion of a diameter suchthat the shell members are adapted to be telescopically engaged onewithin the other in a sliding frictional fit to provide electricalconnection therebetween, a conductive pin member coaxially disposed inforward portions of each shell member, each of said pin members having abore at one end adapted to receive cable center conductor and bedeformed inwardly thereagainst, apertures in each said shell memberoverlying said pin bores to permit die insertion for deforming said pinmembers, the pin members having forward portions which are of diameterssuch that the members are adapted to be telescopically engaged onewithin the other in a sliding frictional lit to provide an electricalconnection therebetween, each pin member supported by an insulatingmember secured to said shell and in form-tting Contact with theV pinmembers along a substantial portion proximate saidr one end, theinsulating member of one shell member extending over the entire lengthof the pin member of the same shell member and the insulating member ofthe other shell member extending over the length of the associated pinmember less the length of the telescopic engagement, the insulatingmembers of each shell member further including as an integral portion asleeve extension beneath the area to be crimped and positioned in andengaging the rear sleeve extension of the shell member along its lengthwhereby air voids within said shell members are minimized, a C-shapedspring member for each shell member with each spring member of adiameter adapted to snap fit over each shell member, each spring memberincluding an inner projection of a configuration to fit within a shellaperture to orient and secure said spring member on said shell member,each spring member including prongs extending radially and adapted tocooperate with projections of insulating blocks for mounting saidconnectors.

3. An improved connector for interconnecting electrical signal cables ofthe type having a center conductor surrounded by an insulating sheathwith an outer metallic braid thereover surrounded by a protectivejacket, comprising in combination, a pair of metallic shell members eachhaving rear sleeve extensions which each have a diameter approximatingthat of the braid of the cable to be interconnected such as to be fittedbetween cable braid and over the cable insulating sheath with theinsulating sheath and center conductor extending Within each shellmember, a ferrule for each said extension of a diameter to permit saidferrule to be fitted over the cable jacket and crimped inwardly to gripthe said cable and force said braid into electrical contact with eachextension, the outer portion of each shell member including threading ofthe same diameter and there is included a further shell member adaptedto extend over both shell members, said further shell member includinginternal threading engaging the said shell member threading to hold saidshell members together, each shell member having a forward portion of adiameter such that the shell members are adapted to be telescopicallyengaged one within the other in a sliding frictional fit to provideelectrical connection therebetween, a conductive pin member coaxiallydisposed in forward portions of each shell member, each of said pinmembers having a bore at one end adapted to receive cable centerconductor and be deformed inwardly thereagainst7 apertures in each saidshell member overlying said pin bores to permit die insertion fordeforming said pin members, the pin members having forward portionswhich are of diameters such that the members are adapted to betelescopically engaged one within the other in a sliding frictional t toprovide an electrical connection therebetween, each pin member supportedby an insulating member secured to said shell and in form tting contactwith the pin members along a substantial portion proximate said one end,the insulating member of one shell member extending over the entirelength of the pin member of the same shell member and the insulatingmember of the other shell member extending over the length of theassociated pin member less the length of the telescopic engagement, theinsulating members of each shell member further including a sleeveportion extending along the length of the shell rear sleeve extensionbeneath the area to be crimped and having a bore adapted to receive andsupport the insulating sheath of the cable along the length of theextension whereby air voids Within said shell members are minimized.

4. An improved connector for interconnecting electrical signal cables ofthe type having a center conductor surrounded by an insulating sheathwith an outer metallic braid thereover surrounded by a protectivejacket, comprising in combination, a pair of metallic shell members eachhaving rear sleeve extensions which each have a diameter approximatingthat of the braid of the cable to be interconnected such as to be fittedbetween cable braid and over the cable insulating sheath with theinsulating sheath and conductor extending within said shell member, aferrule member for each said extension of a diameter to permit saidferrule member to be fitted over the cable jacket and crimped inwardlyto grip the said cable and force said braid into electrical contact Witheach extension, the pair of shell members having forward portions whichare of different diameters such that the members are adapted to betelescopically engaged one within the other in a sliding frictional litto provide an electrical connection therebetween, a pair of conductivepin members coaxially disposed in forward portions of each shell member,each of said pin members having a bore at one end adapted to receive acable center conductor and be deformed inwardly thereagainst, the saidshell members having apertures positioned over said bore portions ofsaid pins to accommodate the insertion of dies to deform said pinsinwardly, the pin members having forward portions which are of diameterssuch that the members are adapted to be telescopically engaged onewithin the other in a sliding frictional lit to provide an electricalconnection therebetween, each pin member supported by an insulatingmember secured to said shell and extending from the outer end of saidshell extension along the inner bore of said shell member overlying thesaid bore of said pin member and in form tting Contact with the pinmembers along a portion of such length and in form litting contact withthe insulating sheath of the cable along a substantial portion of thelength inserted within the shell member, the insulating member of oneshell member extending over the entire length of the pin member of thesame shell and the insulating member of the other shell member extendingthe length of the associated pin member less the length of thetelescopic engagement and the insulating members of both shell membersextending beneath the area to be crimped whereby air voids areminimized.

5. The connector of claim 4, wherein the said insulating member of eachshell is of one piece.

6. In an improved connector assembly for interconnecting electricalsignal cables of the type having a center conductor surrounded by aninsulating sheath with an outer metallic braid thereover surrounded by aprotective jacket, the combination including connector halves comprisingrelatively thin conductive material shell members each including aforward contact portion, an intermediate portion and a rear sleeveextension of a diameter approximating that of the cable braid, adielectric insert fitted within each shell member and of a length toextend along a substantial portion of the shell member and of a diameterto be in form-litting engagement with the inner surface of said shellmember along a substantial portion of the insert length, each saidinsert including a sleeve portion extending along the full length ofsaid shell member extension, a malleable ferrule adapted to be fittedover said shell member extension and crimped inwardly against the outermetallic braid of said cable to terminate said braid to said extension,the said insert sleeve extension extending beneath the area to becrimped and including a first bore adapted to engage and support theinsulating sheath of the cable inserted within said shell member andforwardly thereof a second bore of smaller diameter adapted to engageand support a center contact member adapted to receive and be crimped tothe cable center conductor, the said insert by the said engagement withthe inner surface of the shell member and the engagement with the end ofthe contact member and the insulating sheath inserted within the shellmember operating to seal the end of the pin member and preclude theengagement therewith with any portion 4of the braid of said cable.

References Cited by the Examiner UNITED STATES PATENTS 2,220,516 11/1940Foute 339-130 2,379,942 7/ 1945 Webber. 2,540,012 1/1951 Salati 339-177X 2,870,420 1/1959 Malek 339-177 X FOREIGN PATENTS 693,052 7/ 1940Germany.

588,110 5/1947 Great Britain.

816,846 7/ 1959 Great Britain.

OTHER REFERENCES Brochure of AMP Pdts for shielded and coaxial wire,copyright 1959 by AMP Inc.

Specications, issued by AMP Inc., copyright 1958 by AMP Inc.

JOSEPH D. SEERS, Primary Examiner.

6. IN AN IMPROVED CONNECTOR ASSEMBLY FOR INTERCONNECTING ELECTRICALSIGNAL CABLES OF THE TYPE HAVING CENTER CONDUCTOR SURROUNDED BY ANINSULATING SHEATH WITH AN OUTER METALLIC BRAID THEREOVER SURROUNDED BY APROTECTIVE JACKET, THE COMBINATION INCLUDING CONNECTORS HALVESCOMPRISING RELATIVELY THIN CONDUCTIVE MATERIAL SHELL MEMBERS EACHINCLUDING A FORWARD CONTACT PORTION, AN INTERMEDIATE PORTION AND A REARSLEEVE EXTENSION OF A DIAMETER APPROXIMATING THAT OF THE CABLE BRAID, ADIELECTRIC INSERT FITTED WITHIN EACH SHELL MEMBER AND OF A LENGTH TOEXTEND ALONG A SUBSTANTIAL PORTION OF THE SHELL MEMBER AND OF A DIAMETERTO BE IN FORM-FITTING ENGAGEMENT WITH THE INNER SURFACE OF SAID SHELLMEMBER ALONG A SUBSTANTIAL PORTION OF THE INSERT LENGTH, EACH SAIDINSERT INCLUDING A SLEEVE PORTION EXTENDING ALONG THE FULL LENGTH OFSAID SHELL MEMBER EXTENSION, A MALLEABLE FERRULE ADAPTED TO BE FITTEDOVER